Air conditioning system



y 11, 1955 w. H. GOETTL 3,182,718

AIR CONDITIONING SYSTEM Filed Aug. 26, 1963 4 Sheets-Sheet 1 IN VENTOR.

2A BY WILLIAM H. GQETTL May 11, 1965 w. H. GOETTL AIR CONDITIONING SYSTEM 4 Sheets-Sheet 2 Filed Aug. 26, 1963 INVENTOR.

H I: 86 A] 8 1k WILLIAM H.GOETTL 86 1| EY y 11, 1965 w. H. GOETTL 3,182,718

AIR CONDITIONING SYSTEM Filed Aug. 26, 1963 4 Sheets-Sheef. s

INVENTOR.

WILLIAM H. GOETTL y 1965 w. H. GOETTL 3,182,718

AIR CONDITIONING SYSTEM Filed Aug. 26, 1963 4 Sheets-Sheet 4 INVENTOR. 28 WILLIAM H.GOETTL BYA X United States Patent s,1s2,71s Am CGNDITIUNENG SYSTEM William H. Goettl, 4627 N. Granite Reef Road, Scottsdale, Filed Aug. 26, 1963, Ser. No. 304,569 13 Claims. (Cl. 165-60) The present invention relates to an air conditioning system, and more particularly to an air conditioning system wherein heated air, evaporatively cooled air, or refrigerated air may be moved to a point of use by a single blower; said air conditioning system employing novel blower housing and air flow controlling devices and being a very compact unitary system.

Heretofore, air conditioning systems which operationally utilize evaporative cooling, refrigerated cooling and/or heating usually employ at least two blowers and rather complex ducting or air flow controlling devices. Accordingly, such previous systems have been relatively complicated and expensive, both from the initial stand point and the operational standpoint.

In the sale and installation of air conditioning equipment, it has been a problem to provide a common unit which affords the convenience of installing either an evaporative cooler or a refrigeration cooler together with a heating system. Ordinarily such optional equipment, according to prior art devices, has imposed the necessity of making structural changes in the system after an installation has been initially made.- Such'changes are usually of a diflicult and expensive nature, and ordinarily involve the addition of air moving blowers, or at least one blower, to deliver the conditioned air to a point of use. This being necessary because the usual evaporative cooler requires an air delivery blower, and the heater or refrigeration cooling system may require another, or

V separate, blower for the delivery of conditioned air to the interior of a building room or a point of use.

Accordingly, it is an objectof the present invention to provide a very simple air conditioning system employing but one blower for use in delivering conditioned air to the interior of a room or a point of use, said blower being disposed in relation to an evaporative cooler, a refrigeration cooler, and/or a heater so that the single blower is capable of furnishing conditioned air from any one of the three conditioning units.

Another object of the invention is to provide a very simple air conditioning system having a single blower and novel blower housing and casing means together with airflow controlling devices which provides very simple and automatic control of the optional delivery of evaporatively cooled air, refrigeration cooled air, or heated air to the interior of a room or a use location.

Another object of the invention is to provide an air conditioning system employing a single blower to deliver evaporatively cooled air, or refrigerated air, and wherein a novel air flow controlling means when operated to cause the blower to deliver evaporatively cooled air opens an exhaust passage means to the outside atmosphere so that return air to the unit may be exhausted to the atmosphere in order to provide for volume flow of evaporatively cooled air internally 0f the room being conditioned.

Another object of the invention is to provide a novel air conditioning system wherein a single blower is disposed to deliver evaporatively cooled air, heated air, or refrigeration cooled air, and wherein a condenser of a refrigeration system to provide refrigeration cooled air is disposed with an air impelling means which draws air from an evaporative cooler means of the system to cool the condenser of the refrigeraiton system when the system is delivering air cooled by refrigeration.

3,182,718 Patented May Ill, 1965 Another object of the invention is to provide an air conditioning system wherein a blower impeller is housed in a conventional blower housing, said blower housing being surrounded by a second housing having a pair of inlets which may alternately be opened and closed by an air flow controlling means so that air may either be drawn through one of the inlets into the last mentioned housing from an evaporative cooler pad, or from a heater or from a refrigeration cooled means, so that the second housing surrounding the blower housing serves as a control means alternately usable to cause the blower housing to deliver either evaporatively cooled air, heated air, or refrigerated air.

Another object of the invention is to provide a novel air conditioning system wherein a single blower is disposed to deliver either evaporatively cooled air, refrigerated air, or heated air, and wherein an automatically operable damper system is provided with a pair of damper plates having differential area relative to each other, one of the plates being loaded to a closed position and having the greatest area whereby the motor, when operated at high speed to drive the blower, causes a differential air pressure to act on the air flow controlling means and to open one inlet to the blower for drawing evaporatively cooled air therethrough while closing the other inlet to the blower which, when the motor operates at low speed, permits the air flow controlling means to admit refrigerated or heated air to the inlet of the blower.

Other objects and advantages of the invention may be apparent from the following specification, appended claims and accompanying drawings in which:

FIGURE 1 is a fragmentary side elevational view of the structure of an air conditioning system in accordance with the present invention showing portions thereof broken away to amplify the illustration;

FIGURE 2 is a top or plan view of the structure shown in FIGURE 1 and taken from line 2-2 of FIG- URE 1;

7 FIGURE 3 is a plan sectional view taken from the line 3-3 of FIGURE 1; I,

1 FIGURE 4 is a sectional view taken fronrline 4-4 ofFIGURE 3; t

FIGURE 5 is atop or plan view of a modification of the invention showing portions thereof broken away and in section to amplify the illustration;

FIGURE 6 is a vertical sectional view of a modification of the invention, said view being similar to that of FIG URE 4;

FIGURE 7 is an enlarged fragmentary sectional view of a damper and damper seal gasket means of the invention;

FIGURE 8 is a diagrammatic view showing structure similar to that shown in FIGURE 6 of the drawings, and illustrating a mode of operation of a spring loaded damper mechanism of the invention; and

FIGURE 9 is another view similar to FIGURE 8 and showing a varying position of the damper means disclosed in FIGURE 8.

As shown in FIGURES l to 4, inclusive, the air conditioning system of the invention comprises a blower impeller 10 which is rotatably mounted in a conventional centrifical blower housing 12 having a downwardly directed outlet 14. The blower housing 12 is provided with axial inlet eyes 16.

A motor 18 mounted on the housing 12 is provided witha pulley 20 engaged by a belt 22, also engaged with a pulley 24 on a shaft 16 which carries the impeller 10 in the conventional manner. This impeller 10 is a squirrel cage impeller, however, it will be understood that in accordance with the invention the blower com- 25 prising the impeller and housing 12 may be any suitable or equivalent blower or air impelling structure.

Surrounding and enclosing the blower housing 12 is a second housing 26 having a pair of inlet openings 28 and 30 which are disposed to be opened or closed by an air flow controlling device which comprises a damper 32 hinged at 34 to an upper portion of the housing 26.

The damper 32 is provided with a flap 36 and another flap 38. The damper 32 thus pivoted about the axis of the hinge 34 is such that the flap 36 is disposed to open or shut the opening 28 and the flap 3% is disposed to' open or shut the inlet spring opening 30 and/ or an exhaust opening 41 in the top of an evaporative cooler housing 42.

This evaporative cooler housing partially surrounds or encloses the second housing 26 and evaporative cooler V pads 44 and 46 are mounted in the sides of the evaporative cooler housing 42 and provide air inlets to the interior of the housing 42, aswill be hereinafter described.

A sump 48 in the bottom of the evaporative cooler housing 42is disposed to hold water which is admitted to the sump 48 by means of a conventional conduit 50 coupled to a float valve 52 having a float 54 controlling the level of the water in the sump 48. A motor driven pump 56 is provided with anoutlet conduit 58 coupled to distributor tubes 66 and 62 which deliver water to troughs 64 and 66 at the upper portions of evaporative cooler pads 44 and 46.

It will thus be seen that the float valve 52 and float 54 maintain a level of water in the sump 48 and that the pump 56 supplies water to the troughs 64 and 66 so that the evaporative cooler pads will be wet and thereby furnish an inlet for air to the evaporative cooler housing 42, and thus to permit the evaporatively cooled air to be drawn through the opening 28 when the damper plate 36 is in a broken line position A, which is an open position thereof, this position being attained by a mechanical actuator 68 of a conventional electric motor or solenoid actuator type. This actuator 68 is provided with an arm 70 pivotally mounted to the damper plate 36 so that it concurrently operates the damper plate 36 and the damper plate 38 about the axis of the hinge 34.

This actuator 68 is energized to open the damper plate 36 to the broken line position A and to close the damper plate 33 to the broken line position B when the motor 18 is energized at high speed to draw air through the evaporative cooler pads 44 and 46 and through the opening 28 to deliver the air as indicated by arrows C into a duct 72 leading to a use location or the interior of a building room.

The motor 18 being a two speed motor is capable of operating the impeller 16 to create sufiicient air flow to operate the unit as an evaporative cooler hereinbefore described, or when the motor 13 is energized to operate at low speed, the actuator 68 is energized to movethe damper plate 36 and the damper plate 38 into the solid line positions wherein the inlet opening 28 is closed and the inlet opening 30 is opened and the exhaust opening 40 is closed.

Communicating with the inlet opening 36 of the second housing 26 is a passage 74 communicating with the interior of a third housing section 76 wherein a refrigeration evaporator coil 78 is located. This coil may re- .motely be plumb to the remainder of a conventional refrigeration system having a compress-or, condenser and condenser cooling means.

A flow path in the housing 76 communicating with the opening 74 and the coil 78 passes through a heater 8t? which may be gas fired, electrically heated, or otherwise. This passage through the heater 80 is substantially horizontal and communicates with a passage means 82 in the lower portion of the housing 76, and this passage 82 communicates through an opening 84 in the bottom of the housing 76, said opening 84 communicating with an air return duct structure 56 which is disposed to deliver air 7 from a room to the inlet 84 so that when the unit is through the duct 86, the heater 80, and/ or the coils78 may be exhausted through the opening 46 in the top of the evaporative cooler housing 42, so that the evaporatively cooled air may be exhausted in large volume to the ambient atmosphere outside the building to which the air is delivered through the duct 72. Thus the doors and windows of the building room may remain closed and the evaporatively cooled air, may be exhausted through the opening 40, which is the exhaust opening for the unit. Thus the damper plate 38 automatically provides for exhaust of the evaporatively cooled air when the damper plate 36 is open and the blower pulls air through the evaporative cooling pads 44 and 46.

A suitable flue 88 is provided for the heater 8% in the event it is gas fired, however this heater may be an elec trical strip heater if desired. I

In the modification, as shown in FIGURE 5 of the drawings, a condenser housing 90 may be coupled to one side of the evaporative cooler housing 42, and a plurality of air flow control dampers 92 are mounted freely to pivot into open or closed position either to permit flow from the interior of the evaporative cooler housing 42 to the interior of the condenser housing 90, or to shut off such flow, depending upon operation of the unit, as will be hereinafter described.

When the damper plate 38 is in the solid line position shown in FIGURE 4 and plate 36 is also in the solid line it creates a partial vacuum in the condenser casing 90 which automatically causes air pressure to open the flow control dampers or louvers, which are pivotally mounted on vertical axes 106. Thus these louvres then permit ir to be drawn from the interior of the evaporative cooler casing 42, and thus air is then forced to flow through the evaporative cooler pads 44 to thereby cool the air which passes through the flow control dampers 92 and to a location internally of the casing ti from which it is forced downwardly through the condenser 96. Thus the condenser 96 is permitted to operate at .a much lower temperature than ambient and may for this reason be a smaller unit than it would otherwise be if it were forced to operate in the ambient air. Conversely, the condenser 96 may operate at a greater safety factor if it is of a size normal to that used in connection with ambient cooling.

The condenser casing may readily be coupled to the side wall of the evaporative cooler housing and may include the air flow control dampers 92 or any other suitable device.

When the unit is operating with the damper plate 36 in the broken line position A, as shown in FIGURE 4 '42 causes the flow control dampers 92 to close and thereby prevent a reverse flow of air through the condenser 96, and thus seals the side wall on the evaporative cooler housing 42 so that air is eiliciently drawn through the evaporative cooling pads 44 and 46.

In the modification of the invention, as shown in FIG- URE 6 of the drawings, the damper plate '36 is of larger area than the damper plate 38, and the damper mechanism is thus normally spring loaded closed by a spring 102 and when the motor 18 is operated at low speed this spring 162 overcomes the normal pressure differential between the negative air pressure acting on the damper plates 36 and 38, it being appreciated that more force is created on the damper plate 36 than on the damper plate 38 but the force of the spring 102 makes up for this diiierential and holds the damper plate 36 closed when the motor 18 is operating the impeller 10 at low speed. A second spring 194 applies a minor amount of force to the damper 38 in order to prevent flutter or rattling tendency of the assembly.

When'the motor 18 is operated at high speed, causing substantially greater negative pressure internally of the second housing 26, the differential pressure imposed between the damper plates 36 and 38 is sufiicient so that the spring 102 is extended to the position shown in FIG- URE 9 of the drawings, thus opening the damper plate 36 and closing the damper plate 38. In this position, when the blower is operated at high speed, air flows through the opening 28 and the damper plate 38 shuts off fiow outwardly through the exhaustyopening 40.

It will be appreciated that the disclosures of FIGURES 8 9 are diagrammatic and that suitable mountings of the springs 102 and 104 may be attended to as desired in accordance with the particular installation made.

' It will be seen that the damper modification shown in FIGURES 8 and 9 is therefore automatically operable by a change in speed of the motor 18, and that the damper is thus moved into the appropriate position in accordance with an air pressure differential imposed upon the damper plates 36 and 38 in accordance with the diflerence in area between these plates, said damper plate '36 being of greater area than the plate 38, and this damper plate 36 being operated to open position by an increase in air pressure occasioned by high speed operation of the blower impeller 10 for use in impelling evaporatively cooled air through the pads 44 and 46 and to a use location through the duct 72. i

As shown in FIGURE 7 of the drawings, the damper plate 3 6 at its peripheraledges may engage a gasket 106 surrounding the opening 28 so that an et'ricient closing shut off seal is provided for the damper plate 36. Such gasket structure, similar to the gasketltle, may be used in connection with the damper plate 38 and/or the flow control damper structures 92 hereinbefore described.

The gasket 1% maybe made of any soft compressible material, such as sponge rubber or the like, or any other suitable material. 7

It will be obvious to those skilled in the art that various modifications of the present invention may be resorted externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; and means in said third housing for heating air for delivery to said other of said inlets.

2. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second blower control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing partially surrounding said second housing and communicating with one of said inlets thereof; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; and refrigeration means for conditioning air in said third housing for delivery to said other of said inlets.

3. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; a refrigerator evaporator coil in said third housing; and an inlet of said third housing disposed to direct inlet air to be conditioned through said coil to said other inlet of said second housing.

4. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communieating with the other of said inlets of said second housing; a heater in said third housing; and an inlet of said third housing disposed to direct inlet air to be conditioned through said heater to said other inlet of said second housing.

5. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower'inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing cornmunicating with the other of said inlets of saidsecond housing; a second duct disposed to deliver conditioned air to a point of use; said second duct communicating with said outlet of said blower housing; a third duct disposed to deliver air to said inlet of said third housing.

6. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air fiow from the exterior thereof to -the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; said outlet of said blower housing and said first duct means opened downwardly; and an evaporative cooler sump of said evaporative cooler housing partially surrounding said inlet of said third housing and said outlet of said blower housing. 7

7. In an air conditioning system the combination of:

' a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating. with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing cornmunicating with the other of said inlets of said second housing; a multiple speed motor disposed to drive said impeller; said first and second flow control means being dampers of different areas and connected together and pivotally mounted so that one damper closes as the other opens and vice versa, said dampers loaded toward a closed position of the damper having the greatest area and so loaded to resist the air pressure differential on both dampers to maintain the greater area damper closed; said motor when operated at high speed for forcing air through said evaporative cooler pad causing said impeller to create a greater pressure difierential on said dampers, such that, force on the damper of greatest area causes it to open and consequently to close the other damper with relation to said respective inlets in said second housing.

8. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying Water to said pad; a third housing communicating with the other of said inlets of said second housing; a wall structure of said second and third housings being common.

9. In an air conditioning system the combination or: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first andsecond inlet openings of said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing cornmunicating with the other of said inlets of said second housing; an evaporative cooler sump partially surrounding said second housing.

10. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet means for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the'interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of. said second housing; an evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; a refrigerator evaporator coil in said third housing; a heater in said third housing in series flow relation with said evaporator coil and upstream thereof so that air flows through said heater and thence through said evaporator coil; and an inlet of said third housing disposed to direct inlet air to be conditioned to flow through said heater and said coil to said other inlet of said second housing.

11. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing; a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating eX- ternally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an evaporative cooler housing communicating with one of said inletsof said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; a refrigerator evaporator coil in said third housing; and an inlet of said third housing disposed to direct inlet air to be conditioned through said coil forcing air outwardly from the interior of said evaporative cooler housing and tothe interior of said casing and outwardly through said condenser, whereby cooling air for said condenseris'drawn from said evaporative cooler housing to cool said condenser when said first and second flow control means is disposed to permit flow only from said third housing into said second housing and thence through said blower'to a point of ,use.

12. In an air conditioning system the combination of:

I a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower housing;

a second housing surrounding said blower housing; said blower inlet communicating with the'interior of said second housing; said blower outlet communicating exter-' the interior thereof; first and second fiow control means tive cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third housing communicating with the other of said inlets of said second housing; a refrigerator evaporator coil in said third housing; and an inlet of said third housing disposed to direct inlet air to be conditioned through said coil to said other inlet of said second housing; and an exhaust passage means disposed to be opened and closed by said. first and second air flow control means; a portion of said first and second air flow control means which opens and closes said other inlet to said second housing disposed to close said exhaust passage when said other inlet is opened and thereby disposed to open said exhaust passage means when said other inlet is closed and when said one inlet to said second housing is open; means disposed to deliver evaporatively cooled airfrom said blower into an enclosure; and further means dis posed to conduct air from said enclosure to said exhaust passage means. i

13. In an air conditioning system the combination of: a blower impeller; a blower housing surrounding said impeller; an inlet and an outlet for said blower. housing;

a second housing surrounding said blower housing; said blower inlet communicating with the interior of said second housing; said blower outlet communicating externally of said second housing and said blower housing; first and second inlet openings in said second housing disposed to conduct air flow from the exterior thereof to the interior thereof; first and second flow control means disposed alternately to open and close said first and second inlet openings of said second housing; an

evaporative cooler housing communicating with one of said inlets of said second housing; an evaporative cooler pad forming an air inlet for said evaporative cooler housing; means for supplying water to said pad; a third .housing communicating with the other of said inlets of said second housing; a heater in said third housing; and an inlet of said third housing disposed to direct inlet air to be conditioned through said heater to said other inlet of said second housing; and an exhaust'passage means disposed to be opened, and closed by said first and second air flow control means; a portion of said last mentioned air flow control means which opens and closes said other inlet to said second housing disposed to close said exhaust passage means when said other inlet is open; said portion of said first and second air flow control means disposed to open said exhaust passage means when said other inlet is closed and when said one inlet to said second housing is open; means disposed to deliver evaporatively cooled air from said blower into an enclosure; and further means disposed to conduct air from said enclosure to said exhaust passage means and to the ambient atmosphere externally of said enclosure. References Cited by the Examiner UNITED STATES PATENTS 2,401,560 6/46 Graham --48 X 2,835,476 5/58 Kohut 16516 2,971,449 2/61 Huckleberry 9838 3,102,586 9/63 Diepenbroek 165-60 CHARLES SUKALO, Primary Examiner. 

1. IN AN AIR CONDITIONING SYSTEM THE COMBINATION OF: A BLOWER IMPELLER; A BLOWER HOUSING SURROUNDING SAID IMPELLER; AN INLET AND AN OUTLET FOR SAID BLOWER HOUSING; A SECOND HOUSING SURROUNDING SAID BLOWER HOUSING; SAID BLOWER INLET COMMUNICATING WITH THE INTERIOR OF SAID SECOND HOUSING; SAID BLOWER OUTLET COMMUNICATING EXTERNALLY OF SAID SECOND HOUSING AND SAID BLOWER HOUSING; FIRST AND SECOND INLET OPENINGS IN SAID SECOND HOUSING DISPOSED TO CONDUCT AIR FLOW FROM THE EXTERIOR THEREOF TO THE INTERIOR THEREOF; FIRST AND SECOND FLOW CONTROL MEANS DISPOSED ALTERNATELY TO OPEN AND CLOSE SAID FIRST AND SECOND INLET OPENINGS OF SAID SECOND HOUSING; AN EVAPORATIVE COOLER HOUSING COMMUNICATING WITH ONE OF SAID INLETS OF SAID SECOND HOUSING; AN EVAPORATIVE COOLER HOUSING; MEANS ING AN AIR INLET FOR SAID EVAPORATIVE COOLER HOUSING; MEANS FOR SUPPLYING WATER TO SAID PAD; A THIRD HOUSING COMMUNICATING WITH THE OTHER OF SAID INLETS OF SAID SECOND HOUSING; AND MEANS IN SAID THIRD HOUSING FOR HEATING AIR FOR DELIVERY TO SAID OTHER OF SAID INLETS. 